Controlling mechanism.



l i m7265565.'

A. L. HAHL. Y GONTROLLING MEGHANISM.

APPLICATION FILED DEO. 9, 1911.

1 ,098,495. Patented June 2, 1914.

4 sEETs-.SHEBT 1.

COLUMBIA vPLIWDGRAPH C0., WAsHlNGrON. D..c.

A. L. HAHL.

GONTROLLING MEGHANISM.

APIfLIoATIoN FILED DB0. 9, 1911.

1,098,495, Patented June 2, 1914 4 SHEETS-SHEET Z.

CDLUMBIA PMNOGRAPH C0.. WASHINGTON. D. c.

A. L. HAHL.

GONTROLLING MEGHANISM.

v v APPLICATION FILED DEO. 9, 1911. 1 ,098,495, Patented June 2, 19.14.

4 SHEETS-SHEET 3.

Hjmllll la ab COLUMBIA PLANDGRAPH C0 WASHINGTON. D. Cv.

A. L. HAHL. GONTROLLING MEGHANISM.

APPLICATION PILBD DB0. 9, 1911.

1,098,495. Patented June 2; 1914.

4 SHEETS-SHEET 4.

W7 W @dwf/MMV@ #fi/5.

CHURIIA MIAMI COHWAIHIW, D. C.

UNITED STATES PATENT oEEioE.

AUGUSTUS L. HAI-IL, OF CHICAGO, ILLINOIS'.

CONTROLLING MECHANISM.

Application filed December 9,1911. Serial No. 664,808.

To all whom, t may concern Be it known that I, AUGUSTUS L. I-IAHL, a citizen of the United States, residing at Chicago, in the county of Cook and tate of Illinois, have invented certain new and useful Improvements in Controlling Mecha nism, of which the following is a specification.

The object of m invention is to provide a master clock mechanism or controlling device for other mechanisms or appliances which must operate at regular and invariable intervals of time.

While the general object of my invention is as stated above, the immediate purpose is to produce a greatly improved master clock mechanism for pneumatic time systems. In pneumatic systems of this character, a master clock or motor operates a series of secondary clocks through a system of air tubes. The motor is released at regular intervals by the detenting devices of a time movement and permitted to send air impulses through the tubes, and thereby actuate the secondary clocks. These detenting devices form a part of the master clock, .and it is very essential that they should be as sensitive and as nearly invariable as it is possible tomake them.

Heretofore, in order to accomplish the detenting without subjecting the escapement to the varying power consuming effects of the ordinary warningdetent and of the perceptible pressure of the stop arm against the stop,-the latter being gradually positioned by a cam, necessitating the slow travel of the arm--certain delicate and indirect connections with the stop had to be employed. IVith said previous indirect method of detenting it was possible for the proper relative positions of the parts to become disturbed or destroyed in case of stoppage, and double runs were made possib-le. In these indirect connections as many as three consecutive actions occurred in the operation of releasing the stop arm. A plurality of independent parts served as locking and releasing devices between the motor and time train. These parts operated by contact without positive connections with each other, and it was possible for the motor train and Specicaton of Letters Patent.

Patented June 2, 1914.

time train to get out of unison. In the present invention the stop and time train are positively and directly linked together by a Single part which prevents this.

My improvements comprise mechanism for effecting an instantaneous positioning of the stop in the path of the stop arm. By this means I am permitted to give to the stop arm a large number of revolutions during the period of operation of the motor, for the reason that the quick movement ot' the stop permits it to enter the path of the arm in the short period of time occupied by a fractional part of one revolution of said arm. These results are effected by certain compound lateral and radial movements of the stop with relation to the stop arm, as will be described later.

A further object of my present invention is to produce a simpliiied form of constant power mechanism (remontoir) for the escapement. 'This consists of a single oscillating arm with a torsion spring at the center, and a pinion-compound or singleso arranged as to furnish an absolutely uniform driving power for the escapement with the friction reduced to a minimum.

A special object of my invention is to provide a direct method of detent-ing, in which positive connections are used between the remontoir and the stop, thereby eliminating loose or free parts that might allow the relative positions of the parts to become destroyed. A single action only occurs iny the operation of releasing the stop arm. K

My improved mechanism is also specially applicable to tower clocks, time recorders, time stamps, etc., and other comparatively heavy power-driven apparatus, which are used as secondary movements and which have to be detented every minute, or as often as every half minute. If these appliances are operated by a time movement the detenting is accomplished without diverting any power from the escapement, or otherwise affecting its operation.V If theyare operated by an impulse of air or electricity the detenting does not require more power thanis needed to run an ordinary secondary clock.

Other objects and advantages of my present invention will become apparent in the following specification when taken in connection with the accompanying drawings, in which- Figure 1 is a plan view of the detenting mechanism. Fig. 2y is a sectional View taken below the upper plate of the framework of said mechanism. Fig. 3 is a sectional view taken along the line 3-3 of Fig. 2. Fig. 4 is a sectional View of the upper portion of the mechanism taken along the line .44 of Fig. 1. Fig. 4lL is a detail of the stop-arm and stop enlarged, and showing the relative movements thereof. Fig. 5 is a perspective view of the stop-carrying and tripping leve-r. Fig. 6 is a perspective view of the stop, shaft, oscillating lever, and connecting link. Fig. 7 is a perspective view of the remontoir arm. Fig. S is a plan view of a modification for use in power-driven secondary mechanism. Fig. 9 is a side elevation thereof. Fig. 10 is a detail of a lever in said modification. Fig. 11 is a detail of another lever. Fig. 12 is a detail of the stop-positioning lever. Fig. 13 is a detail of one of said stops and its supporting lever. Fig. 14 is a detail of another of said stops and its supporting lever. Fig. 15 is a vertical section of said modification, taken along the line 15-15 of Fig. 8. Fig. 16 is a detail of the stop-arm and stops enlarged. Fig. 17 is another detail showing the stops in another position. Fig. 18 is a sectional view through the axis of the positioning levers; and Fig. 19 is a sectional View through the pivotal connection of the stops with their positioning lever, the section being taken along the line 19H19 of Fig. 3.

1 accomplish the principal object of my invention by means of a stop 10 for a stop arm 11, said stop being given a combination of movements, which permits me to gradually move said stop out of the path of the arm and to suddenly move it into the path of said arm at the desired time. The stop-arm 11 Vis given considerable length, and is made to rotate a considerable numbe1 of times between successive operations of the stop 10.

The stop arm 11 is actuated by the motor 12, to which it may be applied for the purpose of controlling' said motor. This motor may be represented in the present application by a train of gearing which is actuated by aweight 13. Trains of gearing of this type are common in clock mechanism, but various other motors may be controlled by my improved detenting mechanism.

The stop-arm 11 carries a spring 11a, which strikes the stop 10 and softens the force of the blow. The stop 10 is given a movement in an outward direction, or radial direction with respect to the arm 11, by a cam 15, which actuates a lever 14 carrying said stop. This cam is carried by a rotating member in the mechanism leading to the motor, as will be described later. The lever 14 is actuated in the opposite direction by a spring' 16, in such manner that when the cam reaches the position shown in Fig. 1 the end of the lever will enter a notch in said cam and the stop 10 will suddenly enter the path of the arm 11.

rThe lever is composed of two arms 17a and 17h, one of which carries a shaft 17, on which the step 10 is fixed. The shaft 17 is rotatably mounted in bearings 17c and 17d in said lever and also carries an actuating arm 18, which has a downwardly depending position. To this arm is attached a link 19 leading to the arm 2O of the re-winding mechanism or remontoir.

The arm 2O is mounted upon a vertical shaft 21, around which is placed the helical spring 22, which drives a time train and which is given a re-winding movement by said arm. The remontoir arm 2O having a very short range of action, through a few degrees only of a revolution, the spring 22 which drives it will have a practically constant tension. For this reason 1 term the said spring a constant power element. The said arm 20 also carries a pinion 23 fixed to a shaft 27 carried thereon and which meshes with one of the gears of the time train. Another pinion 25, fixed to the same shaft 27, meshes with and is driven by an internal gear 26, which is driven by the motor 12. I have described the pinions 23 and 25 as separate pinions, but one pinion of greater length may be used, meshing with both the gear 24 of the time train and the gear 26 of the motor. The gear 26 may also have teeth 28 upon its outer periphery which mesh with and drive the pinion 29 fixed to the shaft 29a, said shaft also carrying a gear 30. The shaft 29a also carries the cam 15, previously referred to.

The gear 30 meshes with and drives a pinion 31 fixed to a shaft 32, said shaft also carrying the stop arm 11. It will be seen that the motor, by means of the gear teeth 23 and intermediate mechanism above described, will drive the stop-arm when said arm is free to move. 1t is the function of the stop 10 to release the stop arm 11 at regular intervals and allow it to rotate.

The gear 24 is fixed to a vertical shaft 33, which is preferably in alinement with the previously mentioned shaft 21 and supported by the bearings in the same. parts of the frame. Upon this shaft 33 is also fixed a gear 34, which meshes with and drives a gear 35 of the time train, said time train comprising the usual mechanism, including the escapement wheel 36 and other parts. This time train is mounted in a separate and removable frame 37, which may be secured to the main frame by a screw 38 and held by suitable pins 38a.

The remontoir arm 20 actuates the link 19 by means of a pin 39, having a position substantiallyV midway between the outer end of said arm and its center. The said arm also carries the depending yoke 40 which supports the pinion shaft 27. The aperture 42 in the end of said arm receives a bearing for the upper end of the shaft 27, while the aperture 43 in the lower portion of said yoke serves as a bearing for the lower end of said sha-ft. The arm is extended beyond the center and is provided with an enlarged portion 44, which serves as a counterweight for the previously described parts.

The remontoir arm has an aperture i45 for receiving the lower end of the spring 22. The upper end of said spring is carried in an aperture 46 in the adjusting collar 47. The screws 48, bearing upon the flanges of said collar, permit clamping of the same in various adjusted positions. The collar is adjusted in a rotary direction to give greater or less tension to the spring.

The stop 10 is given a combination of movements, as illustrated in Fig. 4a, in which the stop is shown in different positions in dotped lines. In the said figure the stop is shown in its inner and upper position by the solid lines 49. In this position its end lies in the path of the stop-arm 11. The next important position occupied by the arm is f shown by the dotted lines 50, which position it reaches after being moved downwardly, as shown by the arrow at the right, said movement being a gradual one. The next movement is a horizontal one, as illustrated by the lower arrow, and the position at the end of this movement is shown by the dotted lines 51. The next movement is an upward one, as shown by the arrow at the left, which is terminated when it reaches the position shown by the dotted lines 52. The next movement is an inward, quick, or instantaneous movement in which the stop takes the position shown by the solid lines 49. The purpose of this instantaneous movement is to permit the stop to enter the path of the arm during a fractional part of one revolution thereof.

The downward and upward movements of the stop are effected by the remontoir arm 2O and its connections thereto. The horizontal movements are effected by the cam 15 and spring 16. Power is stored in the spring 22 through the rotation of the pinion 25 and of the remontoir arm and is imparted to the time train through the pinion 23 and gear 24. The said connections or fulcrums both being on the same side of the pivotal support of said arm, they relieve in a great measure the pressure upon said pivotal support. The spring 22 being rotated a few degrees only, its power is practically constant. For this reason I -term the spring 22 a constant power element.

. It will be seen that the pinion 23 meshes with a gear of the time train on one side of the axis of the shaft 27, and the pinion 25 meshes with a gear of the motor train on the other side of said axis. It will be further seen that the spring 22 has a constanttendency to rotate the arm in one direction, and thereby to carry the shaft 27 and the pinions 23 and 25 with it. A constant pressure will thereby be produced upon the teeth of the gear 24, and this pressure will serve as a driving force for the time train, which will run at the rate permitted by the escapement in the usual manner of all clock trains. Vhen the gear 26 is held stationary by the stop and the gearing leading thereto, the pinions 23 and 25 will have a slow bodily movement, as'permitted by the time train. The arm 20 will move with them and by means of the link 19, lever 18, and shaft 17 the stop 10 will be given a gradual release movement. This movement is the downward movement from position 49 to position 50, as shown in Fig. 4a.

At the instant that the stop 10 leaves the end of the arm 11, said arm is free to rotate and, through the gearing 31, 30, and 29, the gear 2S will be allowed to run. This gear is fixed to a shaft 28, to which may be xed a bevel gear 29a meshing with another bevel gear 29D, which, in turn, is connected with and driven by suitable gearing 29C, leading to the weight 13 or other driving element. The parts leading from 28a to said driving element represent a motor which has a form convenient to illustrate. My controlling mechanism, however, is applicable to various other forms of motors or mechanism which it is desired to control.

The gear 2S, being constantly acted upon by the driving force of the motor, will rotate when the stop arm 11 is free and revolves. During this movement said gear will carry the pinion 25, and hence the pinion 23 and shaft 27 with it, in a bodily movement in a reverse direction to that previously described. This movement will be imparted to the arm 2O and, by means of the link 19, arm 18, and shaft 17, the stop 10 will be given an upward movement from the position indicated at 51 to that indicated at 52.

During the movement last described, the stop 10 is given an outward movement by the lever 17, 17h, which is acted upon by the cam 15. The rising part 15aN of the cam acts upon the end 14 of said lever and immediately imparts said outward movement when the stop arm 11 begins to revolve. The stop is held in its outer position by the cam until the depression 15b again reaches the end of the lever, when the lever is free to drop into it, which it does under the tension of the spring 16. i The tension of the said spring causes the stop 10 to suddenly move into the path of the arm. This movement is practically instantaneous and the arm 11 makes but a fraction of a revolution while it is taking place. By means of this instantaneous action of the stop T am enabled to allow the ar n 11 to malte a very large number of revolutions during each period of operation of the motor. This large number of revolutions is brought about by the ratio of the gears 30, 31, and 28, 29.

As previously stated, the greater the number of revolutions which the stop arm makes in a given time, the less will be the pressure against the stop during the period it is at rest. During said period of rest, therefore, the pressure ofthe stop arm on the stop is extremely light, and when the stop is moved out of its locking or retaining position to release the arm, the friction between the stop and the arm is extremely small.

To reduce the friction of the stop on the stop-arm, as above described, is very important, for the reason that this resistance is one of the principal sources of disturbance in the accurate running of the mechanism. Although the friction at each particular operation is small, yet the disturbing effect resulting therefrom is cumulative, and in a period of twenty-four hours o-r longer interval the inaccuracy in the results produced are very noticeable anl serious. By my improved mechanism above described, T have reduced this disturbing cause to the lowest possible minimum.

ln the modification shown in Figs. 8 to 19, inclusive, T have shown my improved detenting mechanism in the form it would have when applied to secondary clocls, or other secondary appliances which are actuated by pneumatic mechanism, such as a diaphragm acted upon by air pressure.V Such a diaphragm is indicated at 53 in Figs. 8, 9, and 15. This diaphragm may be actuated by air pressure in the tube 53a. A stein 53b leads to a lever 5%, which. actuates two stops 55 and 56.

1n the modiiication here illustrated, l prefer to use two stops 55 and 56 and actuate them alternately by the alternate movements of the diaphragm 53. @ne of the stops is actuated by the upward or intlating movement of the diaphragm, while the other stop is actuated by the downward or de'tlating movement of said diaphragm. @ne of the stops is moved upwardly to release the stop-arm and the other stop 56 is moved downwardly to release said stop arm. These movements are imparted to both said stops by the lever 54, by means of a pin V9 thereon, which enters slots 57 and 58 in said the operation of detenting.

stops, respectively. The purpose of the slots is to permit certain outward and inward 67 and 68. These levers are loosely mounted upon a vertical shaft 73, and have arms 67EL and 66L which bear upon the cams 711;

-and 75 and are actuated thereby. The

springs 85 and 86 produce a constant pressure of said arms upon said cams.

The cam 7 s is provided with a depression 76, over which the lever arm 67a drops in The cam 75 has a similar depression 77 diametrically opposite the depression 76. This depression allows the lever arm 68a to fall into it at the proper time in the operation of the lstops. The two cams have rising parts 7S and 79 for moving the levers to release the stops. These cams and also the gear 81 are [iXed to the upright shaft 80. The gear 81 receives its driving power from the pinion S2 lined to the upright shaft 84. This upright shaft carries a stop-arin 83.

The two stops 55 and 56 are arranged to operate alternately in releasing the stoparm. One of them--55-is given an upward movement in releasing, its position at the time of release being indicated by the dotted lines S9 in F ig. 16. This upward movement is produced by the downward or detenting movement of the diaphragm 53. The said stop 55 is given an outward or radial movement with respect to the stoparm by the lever 68, which in turn is given said outward movement by the lever 67 actuated by the cam 7 4. The outer position of the stop is indicated by the dotted lines 90 in Fig. 16. The downward movement of said stop is produced by the reverse movement of the diaphragm 58. Tts position at the end of this movement is indicated by the dotted line 91. The inward movement of the stop 55 is produced by the spring 85 when the end of the lever 67a drops into the depression 7 6 of the cani 74C.

The stop 56 has a movement very similar to that described for 55, except that it is downward in detenting for releasing the arm. The extremity of its downward movement is indicated by the dotted lines 92 in `Fig. 17. Tts outu ard movement is produced by the lever 64, which is in turn actuated by the lever 66, the latter being actuated by the cam 75. Its position at the end of its outward movement is indicated by the dotted lines 93. An upward movement is then given to it by the connection to the diaphragm 53 during the downward or deflating movement of said diaphragm, and its position at the end of its upward movement is indicated by the dotted lines 94 in F ig. 17. Its inward movement is effected by the spring 86 and the intermediate levers 68 and 64.

Vhen the air is released from the tube 532L the diaphragm 53 will become deflated and the stop 55 will move upwardly and release the arm 83. The same movement of the diaphragm will cause the stop 56 to move upwardly into the plane of said arm. After a half revolution of the cam 75 the lever arm 68u will drop into the depression at 77, due to the tension of the spring S6, and cause the stop 56 to move into the path of the arm. The same half revolution of the shaft on which said cam is mounted will cause the cam 74 to move the lever arm 67a outwardly and cause the stop 55 to move away from the arm 83. Another impulse in the tube 55?El will cause the diaphragm 53 to rise, and the stop 55 will be moved downwardly into the plane of the arm. This stop will be moved into the path of the arm by the spring 85, attached to the lever 67. The stops will therefore be seen to operate alternately and each to be actuated by its respective stroke of the diaphragm.

While I have described my invention more or less precisely as regards details of construction, I do not wish to be understood as limiting myself thereto, as I contemplate changes in the form and proportion of parts, and the substitution of equivalents, as circumstances may suggest or render expedient without departing from the spirit of my invention.

' I claim 2- 1. In a mechanism for controlling time indicating mechanism or the like, a rotating stop arm making a plurality of consecutive revolutions, a stop for said stop arm, a motor, a time movement, oscillating means controlled by the time movement in one direction for moving said stop out of the path of said arm and actuated by said motor in the opposite direction, means for moving and maintaining said stop away from its first named course until the instant of return to said path and then allowing a free return thereof, and means for causing an instantaneous return of said stop to the path of said stop arm.

2. In a mechanism for controlling time indicating mechanism or the like, a rotating stop arm making a plurality of consecutive revolutions, a stop for said stop arm, a motor, a time movement, oscillating means controlled by the time movement in one direction for moving said stop out of the path of said stop arm and actuated by said motor in the opposite direction, means for moving and maintaining said stop away from its first named course until the instant of return to said path and then allowing a free return thereof, and means independent of said oscillating means for causing an instantaneous return of said stop to the path of said stop arm.

3. In a mechanism for controlling a motor, a stop arm actuated by said motor, a` stop for said arm, time-controlled means independent of said motor for moving said stop out of the path of said arm, means connected with said motor for moving and maintaining said stop away from its first named course until the instant of return to said path and then allowing a free return thereof, and means independent of said timecontrolled means for causing an instantaneous return of said stop to the path of said arm.

4. In a mechanism for controlling time indicating mechanism or the like, a motor, a stop arm, a stop for said arm having a time controlled movement in one direction out of the path of said arm, a second movement produced by said motor in a dierent direction to said first named movement, a third movement in a direction opposite to said first named movement, and a fourth movement into the path of said arm.

5. Ina mechanism for controlling time indicating mechanism or the like, .a motor, a stop arm, a stop for said arm having a time Ycontrolled movement in one direction out of the path of said arm, and another movement produced by said motor in a direction away from the path of said first named movement, means for retaining said stop out of the path of said first named movement, and means for instantaneously restoring said stop to its original position.

6. In a mechanism for controlling time indicating mechanism or the like, a motor,

a stop arm, a stop for said arm having a time controlled movement in one direction out of the path of said arm and another movement produced by said motor in a direction away from the path of said first named movement, means for retaining said stop away from said path, means for producing a return movement parallel to the first named movement', and means for instantaneously restoring said stop to its original position.

7. In a mechanism for controlling time indicating mechanism or the like, a stop arm, a motor for moving the stop arm a stop for said arm, a continuously running time movement, connections between said stop and time movement having a single movement for releasing the stop arm and allowing the controlled mechanism to run, and connections between said motor and stop for moving said stop to a position out of the path of said arm.

8. In a mechanism for controlling time indicating mechanism or the like, a stop arm, a motor for moving said stop arm, a stop for said arm, controlling means operating at regular intervals, means by which said controlling means actuates said stop to control said stop arm at said regular intervals, said last named means being positively co-nnected to said controlling means and to said stop, and means controlled by said motor for moving said stop to positions out of and into the path of said arm.

9. In a mechanism for controlling timey indicating mechanism or the like, a stop arm, a motor for moving said stop arm, means operating at regular intervals for releasing said arm and allowing the controlled and means for moving said means to a position out of and subsequently returning it to a position in the path of said arm.

10. In a mechanism Jfor controlling time i indicating mechanisms or the like, a motor, a

time movement, a stop arm driven by said motor, a stop for said stop arm, means for transmitting ower from said motor to said i time movement, said means being supported for bodily movement, said bodily movement being produc-ed by the relative movements of said motor and said time movement, and operating connections between said transmitting means and said stop.

11. In a mechanism for controlling timeA indicating mechanisms or the like, a substantially constant power element, a motor, al time movement actuated by said element, means operatively connected to said motor and to said time movement to which means bodily movement is imparted by the motor, said means being adapted to store power in said substantially constant power element, a movable member driven by said motor, a stop for said member, and operating connections between said means and stop.

12. In a controlling mechanism, a substantially constant power element, a motor, a time movement actuated by said element, means operatively connected to said motor and said time movement, to which means bodily motion is imparted by said motor, anda pivoted member supporting said means, said means receiving power from said motor and imparting it to said time movement at one and the same side of the pivot of said member.

13. In a controlling mechanism, a substantially constant power element, a motor, a time movement actuated by said element,

means operatively connected to said motor and said time movement, to which means bodily motion is imparted by said motor, a pivoted member supporting said means, said means receiving power from said motor and imparting it to said time movement at one and the same side of the pivot of said member, and means actuated by said pivoted member for controlling the movement of said motor.

1a. In a mechanism for controlling time indicating mechanism or the like, va stop arm, a motor operatively connected with said stop arm, a stop for said arm, a continuously ruiming time movement, means by which said time movement actuates said stop at regular intervals, said means being positively connected to said time movement and said sto-p, and means controlled by said motor for moving said stop out oit' and into the path of saidarm.

15. In a mechanism for controlling time indicating mechanism orl the like, a stop arm, a stop for said arm, a time movement connected with and moving said stop in a direction substantially parallelY to the aXis of rotation of said stop arm, and means connected with said controlled mechanism for moving said stop radially with respect to said axis into and out of the path of said arm.

16. In a mechanism for controlling time indicating mechanism or the like, a rotating stop arm making a plurality of consecutive revolutions, a stop for said arm, time movement and movable means controlled by the time movement fin one direction for nio-ving said stop out of the path of said arm and actuated in another direction by said controlled mechanism. Y

17. In a mechanism for controlling time indicating mechanism or the like, a stop arm, a stop for said arm, a continuously running time movement, means by which said time movement gradually removes said stop at regular intervals from the path of said stop arm, and means governed by the controlled mechanism by which said stop is moved in another direction from the path of the arm and subsequently linstantaneously returned to the path of said arm at corresponding regular intervals, said first named means being positively connected with said time movement and said stop.

18. In a mechanism for controlling time indicating mechanism or the like, a stop arm, a stop for said arm, a time controlled means, means by which said time controlled means removes said stop at regular intervals from the path of said stopv arm, and means governed by the time controlled means by which said stop is moved in another direction from the path of the arm and subsequently instantaneously returned to the lirs't movement, one of said movements being parallel to the aXis of rotation of said stop arm., and the other of Said movements being' radial with respect to said aXiS.

ln testimony whereof, I have subscribed path of said arm at corresponding regular intervals, said rst named means beingpositively connected With said time controlled means.

19. In a mechanism for controlling time indicating mechanism or the like, a stop my name.

arm a stop for said arm, a time controlled meaiis connected With and moving` said stop AUGUSTUS L HAHL out of the path of said arm, means connect- Witnesses:

HENRY A. PARKS, ANNA L. WALTON.

ed with said controlled mechanism for movmg said stop 1n a diiferent direction to salcl ve cents each, by addressing the Commissioner of Patents, Washington, D. C.

Copies of this patent may be obtained for 

